Cu(SeO₂OH)₂: Synthesis and crystal structure

Abstract

Crystals of the monoclinic compound Cu(SeO2OH)2 were synthesized under hydrothermal conditions. The crystal structure was refined to Rw = 0.023 for 952 unique data up to sinθ/λ = 0.81 Å−1 (a = 5.7662(4) Å, b = 7.3521(6) Å, c = 6.4474(5) Å, β = 93.28(1)°, Z = 2, space group P21/n). The Cu atom is [4 + 2] coordinated by O atoms. Within the SeO2OH group the two Se – O bonds are shorter by 4.8% and 6.1% as compared with the Se – OH bond of 1.773 Å. Each two SeO2OH groups are hydrogen bonded to form dimers which are combined by the CuO4 squares building sheets running parallel (101). The three-dimensional connection is effected by the longer Cu – O bonds.